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mcp_opendaw_create_dnb_arrangement

Generate a complete drum & bass arrangement with drums, reese bass, and pad across three tracks in one call. Adjust tempo, root note, and bars for custom sections.

Instructions

Create a full drum & bass arrangement — drums + bass + pad across 3 tracks in one call.

This is the first multi-track genre arrangement tool. Instead of creating individual patterns, it generates a complete DnB section with all elements locked together:

  • Track 0: Drums — chopped Amen-style breakbeat with kick, snare, hats, ghost notes

  • Track 1: Bass — Reese-style bassline with sustained notes and syncopated stabs

  • Track 2: Pad — sustained minor chord pad that creates harmonic foundation

The arrangement is tempo-aware: at 174 BPM (default), the patterns are optimized for the classic 170-180 DnB feel. The bass and drums lock rhythmically — bass sustains when drums break, stabs when drums roll.

bpm: Tempo (160-185, default 174 = classic DnB). bars: Arrangement length (4-32, default 8 = typical section). root: Root note for bass and pad. octave: MIDI octave for bass (2 = C2=36). unit_index: AU index with note tracks. drum_track: Track index for drums. bass_track: Track index for bass. pad_track: Track index for pad. velocity: Base velocity 0-1.

Returns notes created per track and total.

Example: create_dnb_arrangement(bpm=174, root="A", bars=8) create_dnb_arrangement(bpm=170, root="F#", bars=16, drum_track=2, bass_track=3, pad_track=4)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
bpmNo
barsNo
rootNoA
octaveNo
velocityNo
pad_trackNo
bass_trackNo
drum_trackNo
start_beatNo
unit_indexNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Discloses key behaviors: tempo-aware, rhythmic locking, track assignments, return value. Lacks details on whether it overwrites existing notes or creates missing tracks. With no annotations, description carries full burden; mostly adequate.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Well-structured with front-loaded purpose, bullet points, parameter list, and examples. Slightly verbose but each section adds value.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Complete description for a complex multi-track arrangement tool. Covers behavior, parameter semantics, and examples. Output schema handles return values.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Provides detailed explanations for all 10 parameters (ranges, defaults, meanings) despite 0% schema description coverage. Fully compensates with clear semantics.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clearly states it creates a full drum & bass arrangement across 3 tracks. Uses specific verb-resource combination, distinct from sibling genre-specific arrangement tools.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly frames as multi-track alternative to creating individual patterns, with genre-specific guidance. Provides examples and notes when to use (DnB genre) vs. other arrangement tools.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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